Find the area of the following surfaces using an explicit description of the surface. The part of

Find the area of the following surfaces using an explicit description of the surface.

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The part of the hyperbolic paraboloid z = x² - y² above the sec- tor R = {(r, 0): 0 ≤ r ≤ 4,-π/4 ≤ 0 ≤ π/4}